SURREY STREET Partners
We Build What Others Advise On

BUILDING
COMPETITIVE
ADVANTAGE

Surrey Street Partners helps companies turn complex technology into production systems that move revenue. From commerce infrastructure to agentic AI, we don't advise from the sidelines — we build.

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INDEPENDENT THINKING,
OPERATIONAL INGENUITY,
UNYIELDING INTEGRITY.

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Our Approach

HANDS-ON
DELIVERY

We embed with your team and build production systems — not decks. Our engagements produce working software, validated architectures, and revenue-ready products. Our combined work spans payments and headless commerce at Twilio and PayPal, open banking platforms at Wells Fargo (1.5B+ API calls, CFPB 1033), capital markets infrastructure across E*TRADE, Schwab, and CBOE, and AI product strategy for native and incumbent operators alike.

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Two principals. 30+ combined years building production platforms in payments, open banking, capital markets, and AI — embedded with your team, not advising from the outside.

Vevina McAllister
Founder & Principal
15+ years building platforms at the intersection of commerce, payments, and developer infrastructure. Twilio, PayPal/Braintree, Amazon, Atlassian, Zillow Group.
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Amy Hoffman
Principal
15+ years building open banking, financial data, and trading infrastructure. Wells Fargo Open Banking, Dow Jones, Charles Schwab, E*TRADE, CBOE.
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Open Banking & Capital Markets
Platform Practice
CFPB 1033 compliance, financial data APIs, derivatives and futures trading platforms, market data infrastructure.
Payments, Commerce & AI
Product Practice
Authorization optimization, headless commerce, multi-party transactions, agentic workflows, and AI-native product strategy.
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Our Process

HOW WE WORK

Discover
We start by understanding your business, your stack, and the constraint that matters most — not by selling a methodology.
Architect
We design systems that work in production, not just on whiteboards. Every architecture decision maps to a business outcome.
Build
We write code, ship prototypes, and stand up infrastructure. Embedded with your team, working in your repos, on your timelines.
Validate
Every deliverable is tested against real users and real data. We don't hand off until it works — and you can prove it works.
Payments & Commerce
Authorization models, headless commerce, multi-party transactions, vault architecture, and SMS payments infrastructure.
Open Banking & Data
Financial data API platforms, CFPB 1033 compliance, consumer-permissioned data, and fintech partnerships.
Capital Markets
Derivatives and futures trading platforms, market data systems, and institutional product strategy.
AI Product Strategy
Production agentic workflows, ML-driven personalization, alternative data, and AI-native product strategy.
Monetization
B2B pricing strategy, usage-based billing, packaging design, and revenue architecture for technical platforms.
Developer Platforms
Developer experience, SDKs, API design, documentation systems, and PLG-to-enterprise commercial transitions.
Workflow Digitization
Software eating offline industries — real estate, lending, last-mile operations — where the operational complexity is the product.
Communications
CPaaS architecture on Twilio and RCS. SMS, in-app messaging, and multi-channel notification infrastructure.
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LET'S BUILD
SOMETHING

We take on a small number of engagements at a time. If you're working on a hard problem in commerce, payments, or AI — let's talk.

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